There are two ways to install npm packages: locally or globally. Choose which kind of installation to use based on how you want to use the package.
require, then you want to install locally. This is
npm install's default behavior.
To learn more about the
install command, check out the CLI doc page.
A package can be downloaded with the command:
> npm install <package_name>
This will create the
node_modules directory in your current directory (if one doesn't exist yet) and will download the package to that directory.
To confirm that
npm install worked correctly, check to see that a
node_modules directory exists and that it contains a directory for the package(s) you installed.
Install a package called
lodash. Confirm that it ran successfully by listing the contents of the
node_modules directory, where you should see a directory called
C:\ npm install lodash C:\ dir node_modules #=> lodash
> npm install lodash > ls node_modules #=> lodash
If there is no
package.json file in the local directory, the latest version of the package is installed.
If there is a
package.json file, npm installs the latest version that satisfies the semver rule declared in
Once the package is in
node_modules, you can use it in your code. For example, if you are creating a Node.js module, you can
Create a file named
index.js, with the following code:
// index.js var lodash = require('lodash'); var output = lodash.without([1, 2, 3], 1); console.log(output);
Run the code using
node index.js. It should output
If you had not properly installed
lodash, you would receive this error:
module.js:340 throw err; ^ Error: Cannot find module 'lodash'
To fix this, run
npm install lodash in the same directory as your
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